private void RaiseTileLoad(Tile tile, Rectangle2D bounds)
{
if (TileLoaded != null)
{
TileLoadEventArgs loadTileArgs = new TileLoadEventArgs();
loadTileArgs.Column = tile.Column;
loadTileArgs.ImageSource = tile.Image.Source;
loadTileArgs.Level = tile.Level;
loadTileArgs.Row = tile.Row;
loadTileArgs.Bounds = bounds;
TileLoaded(this, loadTileArgs);
}
}
private void AddTiles(double resolution, int startCol, int startRow, int endCol, int endRow, bool useTransitions)
{
double num = ((endRow - startRow) * 0.5) + startRow;
double num2 = ((endCol - startCol) * 0.5) + startCol;
List<DistanceTile> list = new List<DistanceTile>();
for (int i = startRow; i <= endRow; i++)
{
for (int j = startCol; j <= endCol; j++)
{
string str = Tile.GetTileKey(i, j, resolution, realResolutions);
Image image = base.Container.FindName(uniqueLayerId + str) as Image;
if (image == null)
{
list.Add(new DistanceTile { Row = i, Column = j, Distance = Math.Pow(i - num, 2.0) + Math.Pow(j - num2, 2.0) });
}
else
{
image.ClearValue(LayerContainer.OutdatedProperty);
}//如果find，说明是上次的，可以标记outdated，予以清除
}
}
list.Sort();//排序?按照distance删除重复的？
int level = MathUtil.GetIndex(resolution, realResolutions);
foreach (DistanceTile disTile in list)
{
string url = string.Empty;
if (this.GetCachedResolutions() != null)
{
if (level == -1)
{
return;//CachedLayer中没有Map的某个尺度
}
url = this.GetTileUrl(disTile.Column, disTile.Row, level, double.NaN);
}
else
{
url = this.GetTileUrl(disTile.Column, disTile.Row, int.MinValue, resolution);
//统一管理token
#if SILVERLIGHT
if (Credential.CREDENTIAL.GetUrlParameters() != null)
{
if (url.IndexOf("?") > 0)
url += "&" + Credential.CREDENTIAL.GetUrlParameters();
else
url += "?" + Credential.CREDENTIAL.GetUrlParameters();
}
#endif
}
Tile tile = new Tile(disTile.Row, disTile.Column, resolution, realResolutions, url, useTransitions);
if (TileLoading != null)
{
double left = this.Origin.X + ((TileSize * tile.Column) * resolution);
double top = this.Origin.Y - ((TileSize * tile.Row) * resolution);
double right = left + (this.TileSize * resolution);
double bottom = top - (this.TileSize * resolution);
TileLoadEventArgs loadingArgs = new TileLoadEventArgs
{
Column = tile.Column,
Level = tile.Level,
Row = tile.Row,
Bounds = new Rectangle2D(left, bottom, right, top),
};
TileLoading(this, loadingArgs);
}
this.AddTile(tile);
}
}
private void bmi_DownloadProgress(object sender, DownloadProgressEventArgs e, Tile tile, EventHandler<DownloadProgressEventArgs> onProgressEventHandler)
{
tile.Progress = e.Progress;
if (!string.IsNullOrEmpty(tile.Url) && (tile.Image != null))
{
if (e.Progress == 100)
{
(sender as BitmapImage).DownloadProgress -= onProgressEventHandler;
if (!this.pendingTiles.ContainsKey(tile.Url))
{
if (base.Container != null)
{
base.Container.Children.Remove(tile.Image);
}
return;
}
bool useTransitions = tile.UseTransitions;
ShowImage(tile.Image, useTransitions);
pendingTiles.Remove(tile.Url);
}
base.OnProgress(GetProgress());
}
}
private void AddTile(Tile tile)
{
if (!string.IsNullOrEmpty(tile.Url) && !pendingTiles.ContainsKey(tile.Url))
{
BitmapImage bitmapImage = new BitmapImage()
{
UriSource = new Uri(tile.Url, UriKind.Absolute)
};
EventHandler<DownloadProgressEventArgs> onProgressEventHandler = null;
onProgressEventHandler = delegate(object sender, DownloadProgressEventArgs e)
{
this.bmi_DownloadProgress(sender, e, tile, onProgressEventHandler);
};
bitmapImage.DownloadProgress += onProgressEventHandler;
tile.Image = new Image
{
Opacity = 0.0,
Tag = tile,
IsHitTestVisible = false,
Name = uniqueLayerId + tile.TileKey,
Stretch = Stretch.Fill,
Source = bitmapImage
};
tile.Image.ImageFailed += new EventHandler<ExceptionRoutedEventArgs>(this.img_ImageFailed);
double resolution = tile.Resolution;
//orginX originY
double left = this.Origin.X + ((TileSize * tile.Column) * resolution);
double top = this.Origin.Y - ((TileSize * tile.Row) * resolution);
double right = left + (this.TileSize * resolution);
double bottom = top - (this.TileSize * resolution);
LayerContainer.SetBounds(tile.Image, new Rectangle2D(left, bottom, right, top));//计算该image的范围
tile.Image.ImageOpened += delegate(object o, RoutedEventArgs e)
{
if (base.Dispatcher.CheckAccess())
{
Action a = delegate
{
this.RaiseTileLoad(tile, new Rectangle2D(left, bottom, right, top));
};
this.Dispatcher.BeginInvoke(a);
}
else
{
this.RaiseTileLoad(tile, new Rectangle2D(left, bottom, right, top));
}
};
pendingTiles.Add(tile.Url, tile);
base.Container.Children.Add(tile.Image);
}
}